⑴ Cable laying method
There are several ways to lay cables, such as buried directly in the ground, using cable trenches and laying along walls.
⑵ General requirements for cable laying
Laying cables must comply with the planning and design requirements of the relevant technical regulations.
① When the laying conditions permit, the cable length can be considered as a margin of 1.5%~2% as a spare for maintenance. Directly buried cables should be buried in a wave shape.
② For the cable lead-in or lead-out building or structure, the cable passes through the floor and the main wall, leads from the cable channel to the pole, or the cable laid along the wall at a height of 2m above the ground and a section of 0.25m buried in the ground. The cable should be protected by a steel pipe, and the inner diameter of the steel pipe shall not be less than twice the outer diameter of the cable.
③ When cables and different pipelines are buried in the first phase, it is not allowed to lay cables in the trenches where gas pipes, natural gas pipes and liquid fuel pipelines are laid; a few cables are allowed to be laid in open trenches or tunnels in water pipes or ventilation ducts, or cross these trenches In the open trench or tunnel of the thermal pipeline, generally do not lay cables; under special circumstances, if the cable does not overheat, a few cables are allowed to be laid in the trench of the thermal pipeline, but they should be separated on different sides, or the cables should be installed Below the heating pipe.
④ The buried depth of the directly buried cable shall not be less than 0.7m, and the trench shall not be 0.6m away from the foundation of the building.
⑤The structure of the cable trench should take into account the issues of fire prevention and waterproofing.
⑥ The metal sheath of the cable, the metal cable head, the protective steel pipe and the metal bracket, etc., should be reliably grounded.
For convenience and safety, it is recommended that customers pre-lay the cables in the cable troughs when connecting the cables from the unit to the ATS Yao switchboard and the parallel cabinet, and make the anti-penetration and anti-leakage treatments. The electrical connection must be reliable to prevent vibration. The loosening, twisting and insulation damage caused.
Post time: Jul-01-2021